Malicious PDF — malware analysis report

Static analysis result for SHA-256 e708f5a5ce436b20…

MALICIOUS

PDF

77.8 KB Created: 2021-02-26 17:32:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ef68ef028fd525c1382c283ce9b1a7d6 SHA-1: 92ef71f5df3e2b4e0ce09bcac94691be95f9221c SHA-256: e708f5a5ce436b20b55bfc808e77c57e804177394d85475b55e3d04fefdb1455
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded URLs, with critical heuristics identifying them as malicious redirectors and part of a link farm on disposable hosting. The ML classifier and ClamAV also flagged this PDF as malicious, strongly indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and contains no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/award?keyword=what+is+the+set+aside+prayer In PDF document text
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/mejafos_kinimutufogite_murebamepegipe_rukit.pdfIn PDF document text
    • http://belkwigs.com/5869127219837yeq.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/e669f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410731/normal_60062fd2a1c01.pdfIn PDF document text
    • http://xsafak.com/xademitadovaxujopx2rod.pdfIn PDF document text
    • http://vebenuzan.22web.org/tebuzokoligutojumaxifaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_5fdb73d6d44fb.pdfIn PDF document text
    • http://lemovifi.iblogger.org/dyson_small_ball_allergy_vacuum_cleaner_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5fc5f5655f221.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/gumulok-favoku-dimadaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_6027e3cf2f1d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/java_yourkit_profiler.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/53491119762.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/65683208296.pdfIn PDF document text
    • http://notufexunu.rf.gd/shiva_112_sutras_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/servsafe_food_handler_exam_answers_2019.pdfIn PDF document text
    • http://doxekapop.rf.gd/babelufowaseditibukusu.pdfIn PDF document text
    • http://lobusiwogix.rf.gd/the_last_of_the_mohicans_flute_music_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 5128 bytes
SHA-256: 9acc5d46b7610e5ea90210497d699a73d5c73eceab79ab4f0360bba008c89c0d
font_01_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 10208 bytes
SHA-256: f398900681b1371fd18d99e74543b46de5532dfe230305d32bd3c15b22d36655

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